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<?php
 
	$in   = '1,4|a1,b4';
	$pair = explode('|',$in);
	$out  = array_combine(explode(',',$pair[0]),explode(',',$pair[1]));
 
	print_r( $out );
?>

Success #stdin #stdout 0.02s 52472KB

stdin

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Standard input is empty

stdout

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Array
(
    [1] => a1
    [4] => b4
)

https://ideone.com/8oRXYx

language:

PHP (php 7.3.5)

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